ISO6721RBDR Digital Isolator Equivalent & Substitute Parts

Part Overview

The ISO6721RBDR is an active, general-purpose dual-channel digital isolator manufactured by Texas Instruments, designed for CAN, RS232, RS485, and SPI communication protocols. This capacitive coupling isolator provides 3000Vrms isolation with a 50Mbps data rate and 100kV/µs common mode transient immunity. The device is packaged in an 8-SOIC surface mount configuration and operates across the temperature range of -40°C to 125°C. Equivalent substitute parts are identified based on identical electrical performance specifications and compatible packaging formats, enabling component selection flexibility for procurement and inventory management.

Substiute Parts

ISO6721RBDR

Texas InstrumentsIn Stock: 3268ISO6721RBDR Datasheet

Current PartRFQ

ISO6721BDR

Texas InstrumentsIn Stock: 5525ISO6721BDR Datasheet

Parametric EquivalentRFQ

ISO6721FBDR

Texas InstrumentsIn Stock: 3460ISO6721FBDR Datasheet

Parametric EquivalentRFQ

ISO6721RFBDR

Texas InstrumentsIn Stock: 3665ISO6721RFBDR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ISO6721RBDR are identified as parametric equivalents within the ISO6721 base product family. Substitution is valid when all electrical specifications, isolation voltage, data rate, timing characteristics, supply voltage ranges, operating temperature, and physical package dimensions remain identical across part variants. The primary differentiator among equivalent parts is packaging format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®, or combinations thereof. These packaging variations do not affect electrical performance or functional compatibility in circuit applications.

The following key parameters determine substitution eligibility:

• Voltage - Isolation: 3000Vrms
• Common Mode Transient Immunity: 100kV/µs
• Data Rate: 50Mbps
• Propagation Delay: 18ns maximum (both directions)
• Pulse Width Distortion: 7ns maximum
• Supply Voltage Range: 1.71V ~ 1.89V, 2.25V ~ 5.5V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Number of Channels: 2 (Unidirectional)

Parameter Comparison

Engineering Selection Recommendations

All four part numbers—ISO6721RBDR, ISO6721BDR, ISO6721FBDR, and ISO6721RFBDR—are active products from Texas Instruments with identical electrical and functional specifications. Selection among these equivalents is determined by packaging and compliance requirements:

ISO6721RBDR (Tape & Reel): Primary specification. Suitable for high-volume automated assembly processes requiring continuous reel feeding.

ISO6721BDR (Cut Tape & Digi-Reel®): Offers flexibility for mixed-volume production runs and manual assembly operations. RoHS3 compliant certification is documented.

ISO6721FBDR (Cut Tape & Digi-Reel®): Equivalent electrical performance with cut tape packaging. Suitable for lower-volume applications and component kitting scenarios.

ISO6721RFBDR (Tape & Reel): Tape & Reel format alternative to ISO6721RBDR. Functionally interchangeable for automated assembly workflows.

All parts maintain Functional Safety (FuSa) certification within the ISO672x series and operate across the full industrial temperature range of -40°C to 125°C. Moisture sensitivity level MSL 2 (1 Year) applies uniformly across all variants.

Frequently Asked Questions (FAQ)

Q: Can ISO6721BDR be used as a direct replacement for ISO6721RBDR in production?

A: Yes. Both parts are electrically identical with matching isolation voltage (3000Vrms), data rate (50Mbps), timing characteristics, and supply voltage specifications. The difference is packaging format: ISO6721RBDR uses Tape & Reel while ISO6721BDR uses Cut Tape & Digi-Reel®. Circuit performance is unaffected by this packaging distinction.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel® packaging?

A: Tape & Reel (TR) packaging supplies components on continuous reels suitable for automated pick-and-place assembly equipment. Cut Tape (CT) & Digi-Reel® packaging provides components in tape segments with optional reel carriers, offering flexibility for mixed-volume production and manual assembly. Electrical specifications and component functionality remain identical.

Q: Are all four ISO6721 variants suitable for CAN, RS232, RS485, and SPI applications?

A: Yes. All four part numbers—ISO6721RBDR, ISO6721BDR, ISO6721FBDR, and ISO6721RFBDR—support CAN, RS232, RS485, and SPI communication protocols with identical performance characteristics including 50Mbps data rate and 100kV/µs common mode transient immunity.

Q: What is the significance of the Functional Safety (FuSa) designation?

A: The ISO672x series, including all four variants, carries Functional Safety certification. This designation indicates compliance with safety-critical application requirements and is relevant for designs requiring functional safety compliance documentation.

Q: Can I substitute ISO6721FBDR for ISO6721RFBDR in an existing design?

A: Yes. Both parts are parametric equivalents with identical electrical specifications, isolation voltage, data rate, timing, and operating temperature range. The only difference is packaging format: ISO6721FBDR uses Cut Tape & Digi-Reel® while ISO6721RFBDR uses Tape & Reel. Circuit functionality and performance are unaffected.

Q: What is the Moisture Sensitivity Level (MSL) requirement for storage?

A: All four variants carry MSL 2 (1 Year) rating. This indicates the components must be stored in controlled humidity conditions and have a one-year shelf life from the date of manufacture under standard moisture-controlled storage conditions.

Q: Are there any compliance or certification differences among the four part numbers?

A: ISO6721BDR carries documented RoHS3 compliance. All four parts are classified under ECCN EAR99 and HTSUS 8542.39.0001. All maintain active product status and Functional Safety (FuSa) certification within the ISO672x series.